measurements in cup

i'm new to this and need help with PARTS AND UNITS

3 parts of pro-mix
5 units of coco peat
2 units of warm castings
1 part large chunky perlite
1 part warm castings

3 cups of pro-mix to 5 cups of coco peat to 2 cups of warm castings... Do you have a specific amount you need to end up with?